Abstract:
The present invention is a debarking ring apparatus to prevent operational downtime of logs debarking by having two debarking rings placed on the same vertical plan, perpendicular to the flow of incoming and outgoing logs, and parallel to each other. Only one ring may be operational at a time. As such, maintenance may be done on one of the rings while the other is in operation. Debarking rings may have varying sizes and shapes independent from each other. Each debarking ring may further have its own frame, actuator and control and motorization modules. A sliding system, supported by a frame, may further direct the lateral displacement of both rings. Also presented is a method of processing logs through the debarking ring apparatus.
Abstract:
The invention relates to a debarking mechanism (1) for the decortication or pretreatment of logs (2) for separately performed final debarking and for the discharge of at least some of the bark removed from a wood stream passing through the debarking mechanism, the said debarking mechanism comprising a number of rotatable debarking shafts (3, 3′) extending parallel to an advancing direction (A) of the logs (2) to be fed therethrough, which are provided with a number of teeth (4) extending beyond the circumferential surface of the shaft (3, 3′). The debarking shafts (3, 3′) are arranged relative to each other in such a way that the logs (2) being processed perform a rotary motion (C) in the debarking mechanism, in which motion the logs (2) are forced in their turn, by the effect of the rotary motion (5) of the debarking shafts (3, 3′), into the upper position, from which they roll down into the lower position on top of the other logs (2) in the debarking machine (1). At least the uppermost debarking shaft (3′), is moved sideways towards the inner part (6) of the debarking mechanism (1) in such a way that the said debarking shaft directs an impact effect on logs (2) colliding with it and moved by the debarking shafts (3) located in a lower position, due to the effect of which the direction of movement of the logs (2) having collided with the said debarking shaft will change in such a way that when dividing the movement into a horizontal and a vertical component, the horizontal component of the movement will point towards the inner part (6) of the debarking mechanism (1). The circumferential speed of the debarking shaft is selected to be the greater the higher the debarking shaft (3, 3′) is positioned. A free passage (7) is arranged for the bark passing over the debarking shaft (3′).
Abstract:
An apparatus and method for machining the surface of logs, in which the log is longitudinally advanced through an opening provided in a rotor disc and the surface of the log is machined by rotatable cutting heads mounted on respective supporting arms pivotably connected to the rotatable disc and rotating therewith around the logs. The cutting heads are rotated around respective axes of rotation, while concurrently the cutting heads rotate with the rotor disc around the log such that the net rotational speed of the cutting heads at the surface of the log is the sum of the speed of rotation produced by the rotatable disc and the speed of rotation of the cutting heads around their respective axes. In the course of machining the logs, the speed of rotation of the rotor disc is varied as a function of conditions at the surface of the log and the rotational speed of the cutting heads around their axes is varied in relation to the rotational speed of the rotor disc to maintain a substantially constant net rotational speed of the cutting heads at the surface of the log.
Abstract:
A debarker arm for a debarking machine, comprised of a crescent shaped member, a debarker arm support, an outwardly forwardly extending flange, a debarker tip receptacle, and a debarker tip seated in said receptacle, the invention comprising said outwardly forwardly extending flange extending above and forwardly of said debarker tip in the direction of incoming logs.